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Changes: Caterpillar D9

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{{ Infobox Tractor
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(clean up required, re linking and UK relavance adding)
  
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| title = Caterpillar D9 series
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| logo =
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| image = Cat D9G at EM wd 2011 - IMG 0517.jpg
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| image_size = 250
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| image_caption = Caterpillar D9G at the [[East Midlands and Link Club Working Day]] 2011
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| introduced =
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| discontinued =
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| productionno =
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| current_model =
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| preceded =
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| supersededby =
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| enginemake = Caterpillar
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| enginemodel =
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| powerhp = 474
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| powerkw = 353
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| governedrpm =
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| displacement =
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| cylinders =
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| bore =
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| stroke =
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| cooling = Water
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| na =
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| turbo =
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| gearbox_type =
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| clutch =
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| gearboxmake =
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| gearsf =
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| gearsr =
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| drive = tracked
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| fuel_type = Diesel
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| fuel_cap =
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| linkage_type =
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| lift_capacity =
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| front_linkage =
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| pto_speed =
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| front_tyre =
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| rear_tyre =
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| length =
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| wheelbase =
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| width =
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| height =
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| weight =
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| turning_circle =
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| cabmake =
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| cabtype =
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| factories = [[USA]]
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| cost_new =
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| plowtating =
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| nebraska_test_no =
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| notes =
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| website = http://www.caterpillar.com/
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| below =
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}}
   
  ⚫
The '''Caterpillar D9''' is a large track-type [[tractor]] series designed and manufactured by [[Caterpillar Inc.]].
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<table border="1" cellpadding="2" cellspacing="0" width="350" align=right>
  
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<tr><td colspan="2" bgcolor="#4169e1" align="center"></td></tr>
  
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<tr><td colspan="2" cellspacing="0" cellpadding="2" color="white" bgcolor="#87cefa"> '''Caterpillar D9 - General Characteristics''' </tr>
  
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<tr><td colspan="2"> [[Image:IDF-D9L003.jpg|350px]] </td>
  
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</tr>
 
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<tr>
 
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<tr><td>[[Engineering vehicle|Engineering Role]]:</td><td> Heavy [[bulldozer]] </td></tr>
  
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<tr><td>Propulsion:</td><td> [[Caterpillar track]]s </td></tr>
  
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<tr><td>Engine model:</td><td>CAT C18 ACERT
  
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(D9T) <br> 3408 HEUI (D9R)</td></tr>
  
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<tr><td>Gross power:</td><td> 464 [[horsepower|hp]] (346 [[kilowatt|kW]]) D9T <br>
  
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474 hp (354 kW) D9R </td></tr>
  
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<tr><td>Flywheel power:</td><td>410 hp (306 kW) D9T<br> 410 hp (306 kW) D9R<br>375 hp (280 kW) D9N <br>460 hp (343 kW) D9L</td></tr>
  
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<tr><td>Drawbar pull:</td><td> 71.6 tons </td></tr>
  
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<tr><td>Operation Weight:</td><td>107,550 lbs (48,784 [[kilogram|kg]])</td></tr>
  
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<td>Length:</td><td> 26.5 ft (8.1 [[Metre|m]])</td></tr>
  
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<tr><td>Width:</td><td> 14.7 ft (4.5 m) (blade)</td></tr>
  
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<tr><td>Height:</td><td> 13 ft (4 m)</td></tr>
  
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<tr><td>Speed:</td><td>7.3 [[MPH]] (11.9 [[km/h]]) Forward<br> 9.1 MPH (14.7 km/h) Reverse</td></tr>
  
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<tr><td>Blade capacity:</td><td>17.7 yd³ (13.5 m³) 9 SU blade<br>21.4 yd³ (16.4 m³) 9 U blade</td></tr>
  
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</table>
  
   
  ⚫
Though it comes in many configurations it has usually been sold as a [[bulldozer]] equipped with a detachable large blade and a rear ripper attachment.
   
  ⚫
The D9, with {{convert|474|hp|abbr=on}} of gross power and an operating weight of 49 tons, is in the upper end, but not the heaviest, of Caterpillar's track-type tractors, which range in size from the [[Caterpillar D3|D3]] {{convert|77|hp|abbr=on}}, 8 tons, to the [[Caterpillar D11|D11]] {{convert|935|hp|abbr=on}}, 104 [[Tonne|tons]].
⚫
The '''Caterpillar D9''' is a large track-type [[tractor]] designed and manufactured by [[Caterpillar Inc.]]
  
  ⚫
  ⚫
The size, durability, reliability, and low operating costs have made the D9 one of the most popular large track-type tractors in the world, with the [[Komatsu D275A]] as one of its most direct competitors.
   
  +
Until the introducing of the [[Caterpillar D10|D10]] in 1977 at a dealer meeting, the D9H was the largest conventional bulldozer built by Caterpillar.
⚫
Though it comes in many configurations it is usually sold as a [[bulldozer]] equipped with a detachable large blade and a rear ripper attachment.
  
   
  ⚫
The size, power and weight of the larger track-type tractors dictate that they are used primarily for major projects. The D9 is most commonly found in use in construction, forestry, mining, waste, and quarry operations.
⚫
The D9, with 354 [[kilowatt|kW]] (474 [[horse power|hp]]) of gross power and an operating weight of 49 tons, is in the upper end, but not the heaviest, of Caterpillar's track-type tractors, which range in size from the [[Caterpillar D3|D3]] 57 kW (77 hp), 8 tons, to the [[Caterpillar D11|D11]] 698 kW (935 hp), 104 [[Tonne|tons]].
  
⚫
 
⚫
The size, durability, reliability, and low operating costs have made the D9 one of the most popular large track-type tractors in the world, with the [[Komatsu Limited|Komatsu]] [[D275A]] as one of its most direct competitors.
 
   
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==Engineering and technical description==
 +
==Engineering and technical development==
  +
The D9 is a series of heavy tracked-type tractors, propelled by [[Caterpillar track]]s and usually used as [[bulldozer]]s.
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The D9 is a series of heavy tracked-type tractors, propelled by [[Caterpillar track]]s and usually used as [[bulldozer]]s.It came out as a prototype in 1954 as a D9X.10 D9X prototype models were built in 1954.In 1955 the 286hp D9 was introduced to compete against the Euclid TC-12 which had more hp.The D9 would come equipped with a 1,473 cid D353 which would power the D9 right up until the 1980 introduction of the D9L.The year 1956 the D9 got a boost up to 320hp.The new 335hp D9E would replace that model n 1959.2 years later the legendary 385hp D9G would appear in 1961 and would be on the scene for the next 13 years.Over its 13 year life the D9G would be the main crawler on many,many job sites testifying to its sturdyness and design.In 1965 west coast businessman Buster Peterson hooked up a pair of D9Gs to pushload the largest wheel tractor scrapers built.In 1986 Caterpillar bought the rights to this concept and thus the 770hp DD9G was created.D stands for Dual D9G.Peterson also built the first SxS D9G which has 2 D9Gs side-by-side pushing a 24 foot wide bulldozer blade.In 1969 Cat introduced this new SxS D9G.In 1974 the improved 410hp D9H was introduced to replaced the D9G.The D9H is still the more powerful conventional track-type tractor in company history.The DD9H and the SxsD9H would soon follow.In 1980 the 460hp D9L was introduced.The unit had the same elevated drive sprocket undercarraige that the larger D10 had.It was in the time period of 1970-71 that a D9G was built with a elevated drive sprocket undercarriage .A picture of one can be found on page 95 in a book called "Caterpillar Chronicle" by Eric Orlemann.The D9 has undergone several generations of engineering enhancements. Each new model is denoted with an English letter added to D9 like D9E,D9G,D9H,D9L,D9N,D9R and the current D9T.. Until the introducing of the D10 in 1977 at a dealer meeting, the D9H was the largest conventional CAT dozer. The D9L was the first variation of the D9 to employ elevated drive sprocket design in which the drive sprocket is elevated above the track., and not on the ground. The elevated drive sprocket gives the "belly pan" more ground clearance.The eleveated drive sprocket undercarriage is a modular design.To repair the machines you break down the tracks and pull the drive sprockets out.As a result you can pull the powershift transmission out the rear.The 370hp D9N replaced the D8L in 1987.In 1988 Caterpillar produced their 25,000th elevated drive sprocket track-type tractor which a D9N.The 405hp D9R replaced the D9N in 1996.The 410hp D9T replaced the D9R in 2004.The D9T has a ACERT diesel engine. The current versions are the '''D9R''' and the '''D9T''' models, but older models such as the D9N and D9L are still common. The L, N, R and T models of the D9 are visually very similar, differing primarily in the design of their internal systems.he D9L was replaced by the 520hp D10N in 1987.The 370hp D9N replaced D8L in 1987.the The D9T main difference from the D9R is the installment of the new [[Cat C18 ACERT]] [[engine]]. The D9L is the most powerful D9 in history, with [[flywheel power]] of 460 hp.
  
   
  +
The D9 has undergone several generations of engineering enhancements. Each new model is denoted with a suffix letter to indicate version added to D9 like D9E,D9G,D9H,D9L,D9N,D9R and the current D9T.
⚫
The D9's primary working tools are the [[blade]], affixed to the front and controlled by 6 [[hydraulic]] arms, and the optional [[ripper]], which can be attached to the back. The blade is mainly intended for earthmoving and bulk material handling: pushing up sand, dirt and rubble. It also can be used to push other heavy equipment such as earthmoving scraper pans, and in military applications, [[main battle tank]]s. The dozer [[blade]] usually comes in 3 varieties:
 
  +
⚫
# A Straight Blade ("S-Blade") which is short and has no lateral curve, no side wings, and can be used for fine grading.
 
  +
===Time line===
⚫
# A Universal Blade ("U-Blade") which is tall and very curved, and has large side wings to carry more material.
 
  +
[[File:Caterpillar_D9.JPG|thumb|Early D9 in the [[Auto und Technik Museum, Sinsheim]] Germany]]
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* 1954 - prototype D9X.10
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* 1955 - The {{convert|286|hp|abbr=on}} D9 was introduced to compete against the [[Euclid TC-12]] which had more horsepower. The D9 would come equipped with a 1,473 cid [[Caterpillar D353|D353]] which would power the D9 right up until the 1980 introduction of the D9L.
  +
* 1956 - The D9 got a boost up to {{convert|320|hp|abbr=on}}.
  +
* 1959 - The new {{convert|335|hp|abbr=on}} [[Caterpillar D9E|D9E]] would replace the original D9 model.
  +
* 1961 - The legendary {{convert|385|hp|abbr=on}} [[Caterpillar D9G|D9G]] would appear and be in production for the next 13 years. Over its 13 year life the D9G would be the main crawler on many job sites testifying to its sturdiness and design.
  +
* 1965 - In America, the west coast businessman Buster Peterson hooked up a pair of D9Gs to push the largest wheeled tractor scrapers built. In 1986 Caterpillar Inc. bought the rights to this concept and thus the {{convert|770|hp|abbr=on}} DD9G was created, the D stands for Dual D9G. Peterson also built the first SxS D9G which has 2 D9Gs side-by-side pushing a 24 foot wide bulldozer blade. In 1969 Cat introduced this new SxS D9G.
  +
* 1974 - The improved {{convert|410|hp|abbr=on}} [[Caterpillar D9H|D9H]] was introduced to replaced the D9G. The D9H is still the more powerful conventional track-type tractor in company history. The DD9H and the SxsD9H would soon follow.
  +
* 1980 - The {{convert|460|hp|abbr=on}} [[Caterpillar D9L|D9L]] was introduced. The unit had the same elevated drive sprocket undercarriage that the larger [[Caterpillar D10|D10]] had. But it is noted that in the time period of 1970-71 a Prototype D9G was built with an elevated drive sprocket undercarriage . A picture of one can be found on page 95 in a book called "Caterpillar Chronicle" by Eric Orlemann. The D9L was the most powerful D9 in history, with [[flywheel power]] of 460&nbsp;hp.
  +
* 1987 - The {{convert|370|hp|abbr=on}} [[Caterpillar D9N|D9N]] replaced the [[Caterpillar D8L|D8L]].
  +
* 1987 - The D9L was replaced by the {{convert|520|hp|abbr=on}} [[Caterpillar D10N]].
  +
* 1988 - Caterpillar produced their 25,000th elevated drive sprocket track-type tractor which a D9N.
  +
* 1996 - The {{convert|405|hp|abbr=on}} [[Caterpillar D9R|D9R]] replaced the D9N.
  +
* 2004 - The {{convert|410|hp|abbr=on}} [[Caterpillar D9T|D9T]] replaced the D9R.
  +
  +
==D9L==
  +
  +
{{main|Caterpillar D9L}}
  +
The D9L was the first variation of the D9 to employ elevated drive sprocket design in which the drive sprocket is elevated above the track, and not on the ground. The elevated drive sprocket gives the "belly pan" more ground clearance. The elevated drive sprocket undercarriage is a modular design. To repair the machines you break down the tracks and pull the drive sprockets out. As a result you can pull the powershift transmission out the rear.
  +
  +
===D9T===
  +
[[File:Caterpillar_D9T_-_IMG_8550.JPG|thumb|Caterpillar D9T fitted with a single shank [[Ripper]] (inverted for transport)]]
  +
{{main|Caterpillar D9T}}
  +
The D9T has a Caterpillar ACERT diesel engine. The current versions are the '''[[Caterpillar D9R|D9R]]''' and the '''D9T''' models, but older models such as the [[Caterpillar D9N|D9N]] and [[Caterpillar D9L|D9L]] are still common. The L, N, R and T models of the D9 are visually very similar, differing primarily in the design of their internal systems. The D9T's main difference from the D9R is the installation of the new [[Cat C18 ACERT]] [[engine]].
  +
  +
===Tools===
  ⚫
The D9's primary working tools are the [[blade]], affixed to the front and controlled by 6 [[hydraulic]] arms, and the optional [[ripper]], which can be attached to the back. The blade is mainly intended for earthmoving and bulk material handling: pushing up sand, dirt and rubble. It also can be used to push other heavy equipment such as earthmoving scraper pans, and in military applications, [[main battle tank]]s.
  +
  +
The dozer [[blade]] usually comes in 3 varieties:
  ⚫
# A Straight Blade ("S-Blade") which is short and has no lateral curve, no side wings, and can be used for fine grading.
  ⚫
# A Universal Blade ("U-Blade") which is tall and very curved, and has large side wings to carry more material.
 
# A "S-U" combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.
  
# A "S-U" combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.
 
Like many other bulldozers, the D9 can be fitted with different blades (such as size-9 [[SU blade]] and [[Universal blade]]) or other devices such as [[land mine|mineplows]].
  
Like many other bulldozers, the D9 can be fitted with different blades (such as size-9 [[SU blade]] and [[Universal blade]]) or other devices such as [[land mine|mineplows]].
   
 
The rear ripper is intended for use in loosening rocky ground and ripping out larger stones. It can also break frozen ground and excavate small ditches. The ripper can be replaced with a multi-shank ripper, allowing the bulldozer to comb the ground.
  
The rear ripper is intended for use in loosening rocky ground and ripping out larger stones. It can also break frozen ground and excavate small ditches. The ripper can be replaced with a multi-shank ripper, allowing the bulldozer to comb the ground.
−  
⚫
The size, power and weight of the larger track-type tractors dictate that they are used primarily for major projects. The D9 is most commonly found in use in construction, forestry, mining, waste, and quarry operations.
  
   
 
==Military applications==
  
==Military applications==
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[[Image:D9R rpg-armor06.jpg|thumb|250px|An armored [[Israeli Defence Forces|IDF]] [[Caterpillar Inc.|Caterpillar]] D9R [[bulldozer]], nicknamed "דובי" ([[Teddy bear]]) in [[Israel]]. <br> Its armor allows it to work under heavy fire.]]
  
 
{{seealso|Armored bulldozer}}
  
{{seealso|Armored bulldozer}}
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[[Caterpillar Inc.]] does not manufacture a military version of the D9 per se, but the attributes that make the D9 popular for major construction projects make it desirable for [[military]] applications as well, and in this role - with Israeli modifications and armor - it has been particularly effective for the [[Israel Defense Forces]] (IDF) and later for the [[United States armed forces]] (the [[US Marine Corps|Marine Corps]] and the [[United States Army|US Army]]) in [[Iraq]].<ref>[http://www.youtube.com/watch?v=sJervtj8YEM Video] of US Army / US Marine teams working with civilian contractors from [[KBR (company)|KBR]] Heavy Equipment Transport, using D9s at [[Ar Rutbah]] to build a large defensive berm</ref>
 +
[[Caterpillar Inc.]] does not manufacture a military version of the D9 per se, but the attributes that make the D9 popular for major construction projects make it desirable for military applications as well, and in this role - with Israeli modifications and armour - it has been particularly effective for the Israel Defense Forces (IDF) and later for the United States armed forces (the Marine Corps and the US Army) in Iraq.<ref>[http://www.youtube.com/watch?v=sJervtj8YEM Video] of US Army / US Marine teams working with civilian contractors from KBR Heavy Equipment Transport, using D9s at Ar Rutbah to build a large defensive berm</ref>
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<!--
  
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The [[Israeli Engineering Corps]] used armored versions of the D9L, D9N and D9R to clear [[booby trap|booby-trapped]] areas, open routes, rescue stuck [[armored fighting vehicles]] and build sand mounds. {{Fact|date=February 2007}} During the [[Al Aqsa Intifada]] D9 bulldozers were used to demolish alleged terrorists' houses under fire, as the dozers withstood massive [[Improvised explosive device|IED]]s (some of 200 kg and even 500 kg of explosives) and even deflected [[Rocket-propelled grenade|RPG]] rounds and were impervious to machinegun fire. <ref>[http://www.intelligence.org.il/sp/jenin/jen_yr.htm The blade that won the battle], Israeli Intelligence Heritage Center ([[Hebrew]])</ref> The armored D9 bulldozers were cited by experts as one of the key factors for the relatively low casualties of the [[Israel Defense Forces|IDF]] in [[urban warfare]]. <ref>[http://www.azure.org.il/magazine/magazine.asp?id=216&search_text=Henkin Urban Warfare and the Lessons of Jenin], Yigal Henkin</ref> However, while Israel saw the utilization of bulldozers as a security necessity, it drew controversy for the destruction it caused to Palestinian property, especially in [[Rafah]] and in [[Jenin]] (during [[Operation Defensive Shield]]).
  
   
  ⚫
The US army used D9 bulldozers to clear forest in the Vietnam war but after the war they were replaced with smaller and cheaper [[Caterpillar D7]]G bulldozers. D7G dozers are still very common in US [[combat engineering]] battalions, but there is a resurgent high demand to replace the lighter D7Gs with the newer and more heavily armoured D9s.
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On [[February 7]], [[2006]], the [[General Synod|Synod]] of the [[Church of England]] decided to divest itself of approximately USD$2.2 million in Caterpillar Inc. shares, property of the Church of England. This was seen as a move to distance itself from the Israeli army's documented<ref>[http://www.journeyman.tv/?lid=11034 Video: Gaza: The Killing Zone, 2003]</ref> use of the Caterpillar bulldozers to destroy Palestinian homes. --><!-- Section blanked as non relavent here -->
  
−  
⚫
The US army used D9 bulldozers to clear forest in the [[Vietnam war]] but after the war they were replaced with smaller and cheaper [[Caterpillar D7]]G bulldozers. D7G dozers are still very common in US [[combat engineering]] battalions, but there is a resurgent high demand to replace the lighter D7Gs with the newer and more heavily armoured D9s.
  
   
 
==See also==
  
==See also==
Line 62: Line 120:
   
 
{{start box}}
  
{{start box}}
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{{succession box | before=[[D8]] | title=Machine Models | years=Current | after= D10}}
 +
{{succession box | before=[[Caterpillar D8|D8]] | title=Caterpillar Bulldozers | years = | after=[[Caterpillar D10|D10]]}}
 
{{end box}}
  
{{end box}}
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  ⚫
==References==
  ⚫
Wikipedia for base article (For military applications see Wikipedia article)
  +
{{reflist}}
   
 
==External links==
  
==External links==
−
*[http://www.cat.com/cda/layout?m=163632&x=7 Caterpillar D-Series Track-Type Tractors] - Official Caterpillar website
 +
* [http://www.cat.com/cda/layout?m=163632&x=7 Caterpillar D-Series Track-Type Tractors] - Official Caterpillar website
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* [http://www.classictractors.co.uk/shop/static/caterpillar_d9-d9r_720.htm Book "Caterpillar D9 - D9R" by Thomas Wilk & Urs Peyer]
+
* [http://www.classictractors.co.uk/shop/static/caterpillar_d9-d9r_720.htm Book "Caterpillar D9 - D9R" by Thomas Wilk & Urs Peyer]
 
* [http://www.vannattabros.com/dozer4.html Review on the D9G]
  
* [http://www.vannattabros.com/dozer4.html Review on the D9G]
 
* [http://www.enr.com/features/bizlabor/archives/030922.asp Engineering News: Combat Engineering in Iraq] - including reviews on the D9 Dozer performance in Iraq and nice pictures of it and other [[Combat engineering vehicle|CEVs]]
  
* [http://www.enr.com/features/bizlabor/archives/030922.asp Engineering News: Combat Engineering in Iraq] - including reviews on the D9 Dozer performance in Iraq and nice pictures of it and other [[Combat engineering vehicle|CEVs]]
   
⚫
==References==
  
⚫
Wikipedia for base article (For millitary applications see wikipedia article)
  
−
<references/>
  
   
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{{Caterpillar range}}
   
   
  ⚫
{{wikipedia}}
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[[Category:Tractors|D09]]
  
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[[Category:Caterpillar|D09]]
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[[Category:Caterpillar crawler tractors|D9]]
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[[Category:Construction Plant|D09]]
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[[Category:Construction plant|D09]]
 
[[Category:Bulldozers]]
  
[[Category:Bulldozers]]
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[[Category:Caterpillar D9]]
−  
  ⚫
[[Category:Tractors by model number]]
⚫
{{wikipedia}}
  
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[[Category:474 hp tractors]]
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[[Category:Tractors of the United States]]
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[[Category:9 (model number)]]

Revision as of 04:35, 22 February 2018

Caterpillar D9
Cat D9G at EM wd 2011 - IMG 0517
Caterpillar D9G at the East Midlands and Link Club Working Day 2011
Model history
Model introduced Unknown
Model discontinued Unknown
Model status Unknown
Engine Specification
Engine make Caterpillar
Fuel type Diesel
Power hp 474
Power kW 353
Cooling system Water
Transmission Details
Transmission type Unknown
Drive tracked
Linkage Category Unknown
Other info
Factories USA
Plow rating Unknown
Web site http://www.caterpillar.com/
This box: view · talk

The Caterpillar D9 is a large track-type tractor series designed and manufactured by Caterpillar Inc..

Though it comes in many configurations it has usually been sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment.

The D9, with 474 hp (353 kW) of gross power and an operating weight of 49 tons, is in the upper end, but not the heaviest, of Caterpillar's track-type tractors, which range in size from the D3 77 hp (57 kW), 8 tons, to the D11 935 hp (697 kW), 104 tons.

The size, durability, reliability, and low operating costs have made the D9 one of the most popular large track-type tractors in the world, with the Komatsu D275A as one of its most direct competitors.

Until the introducing of the D10 in 1977 at a dealer meeting, the D9H was the largest conventional bulldozer built by Caterpillar.

The size, power and weight of the larger track-type tractors dictate that they are used primarily for major projects. The D9 is most commonly found in use in construction, forestry, mining, waste, and quarry operations.

Engineering and technical development

The D9 is a series of heavy tracked-type tractors, propelled by Caterpillar tracks and usually used as bulldozers.

The D9 has undergone several generations of engineering enhancements. Each new model is denoted with a suffix letter to indicate version added to D9 like D9E,D9G,D9H,D9L,D9N,D9R and the current D9T.

Time line

Caterpillar D9

Early D9 in the Auto und Technik Museum, Sinsheim Germany

  • 1954 - prototype D9X.10
  • 1955 - The 286 hp (213 kW) D9 was introduced to compete against the Euclid TC-12 which had more horsepower. The D9 would come equipped with a 1,473 cid D353 which would power the D9 right up until the 1980 introduction of the D9L.
  • 1956 - The D9 got a boost up to 320 hp (240 kW).
  • 1959 - The new 335 hp (250 kW) D9E would replace the original D9 model.
  • 1961 - The legendary 385 hp (287 kW) D9G would appear and be in production for the next 13 years. Over its 13 year life the D9G would be the main crawler on many job sites testifying to its sturdiness and design.
  • 1965 - In America, the west coast businessman Buster Peterson hooked up a pair of D9Gs to push the largest wheeled tractor scrapers built. In 1986 Caterpillar Inc. bought the rights to this concept and thus the 770 hp (570 kW) DD9G was created, the D stands for Dual D9G. Peterson also built the first SxS D9G which has 2 D9Gs side-by-side pushing a 24 foot wide bulldozer blade. In 1969 Cat introduced this new SxS D9G.
  • 1974 - The improved 410 hp (310 kW) D9H was introduced to replaced the D9G. The D9H is still the more powerful conventional track-type tractor in company history. The DD9H and the SxsD9H would soon follow.
  • 1980 - The 460 hp (340 kW) D9L was introduced. The unit had the same elevated drive sprocket undercarriage that the larger D10 had. But it is noted that in the time period of 1970-71 a Prototype D9G was built with an elevated drive sprocket undercarriage . A picture of one can be found on page 95 in a book called "Caterpillar Chronicle" by Eric Orlemann. The D9L was the most powerful D9 in history, with flywheel power of 460 hp.
  • 1987 - The 370 hp (280 kW) D9N replaced the D8L.
  • 1987 - The D9L was replaced by the 520 hp (390 kW) Caterpillar D10N.
  • 1988 - Caterpillar produced their 25,000th elevated drive sprocket track-type tractor which a D9N.
  • 1996 - The 405 hp (302 kW) D9R replaced the D9N.
  • 2004 - The 410 hp (310 kW) D9T replaced the D9R.

D9L

Main article: Caterpillar D9L

The D9L was the first variation of the D9 to employ elevated drive sprocket design in which the drive sprocket is elevated above the track, and not on the ground. The elevated drive sprocket gives the "belly pan" more ground clearance. The elevated drive sprocket undercarriage is a modular design. To repair the machines you break down the tracks and pull the drive sprockets out. As a result you can pull the powershift transmission out the rear.

D9T

Caterpillar D9T - IMG 8550

Caterpillar D9T fitted with a single shank Ripper (inverted for transport)

Main article: Caterpillar D9T

The D9T has a Caterpillar ACERT diesel engine. The current versions are the D9R and the D9T models, but older models such as the D9N and D9L are still common. The L, N, R and T models of the D9 are visually very similar, differing primarily in the design of their internal systems. The D9T's main difference from the D9R is the installation of the new Cat C18 ACERT engine.

Tools

The D9's primary working tools are the blade, affixed to the front and controlled by 6 hydraulic arms, and the optional ripper, which can be attached to the back. The blade is mainly intended for earthmoving and bulk material handling: pushing up sand, dirt and rubble. It also can be used to push other heavy equipment such as earthmoving scraper pans, and in military applications, main battle tanks.

The dozer blade usually comes in 3 varieties:

  1. A Straight Blade ("S-Blade") which is short and has no lateral curve, no side wings, and can be used for fine grading.
  2. A Universal Blade ("U-Blade") which is tall and very curved, and has large side wings to carry more material.
  3. A "S-U" combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.

Like many other bulldozers, the D9 can be fitted with different blades (such as size-9 SU blade and Universal blade) or other devices such as mineplows.

The rear ripper is intended for use in loosening rocky ground and ripping out larger stones. It can also break frozen ground and excavate small ditches. The ripper can be replaced with a multi-shank ripper, allowing the bulldozer to comb the ground.

Military applications

See also: Armored bulldozer

Caterpillar Inc. does not manufacture a military version of the D9 per se, but the attributes that make the D9 popular for major construction projects make it desirable for military applications as well, and in this role - with Israeli modifications and armour - it has been particularly effective for the Israel Defense Forces (IDF) and later for the United States armed forces (the Marine Corps and the US Army) in Iraq.[1]

The US army used D9 bulldozers to clear forest in the Vietnam war but after the war they were replaced with smaller and cheaper Caterpillar D7G bulldozers. D7G dozers are still very common in US combat engineering battalions, but there is a resurgent high demand to replace the lighter D7Gs with the newer and more heavily armoured D9s.

See also

Preceded by
D8 		Caterpillar Bulldozers Succeeded by
D10

References

Wikipedia for base article (For military applications see Wikipedia article)

  1. ↑ Video of US Army / US Marine teams working with civilian contractors from KBR Heavy Equipment Transport, using D9s at Ar Rutbah to build a large defensive berm

External links



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